, paper presented at the "Twentieth International Workshop on Bayesian Inference and Maximum Entropy Methods in Science and Engineering," held July 8-13, 2000, in Giv-sur-Yvette, France, and published in Bayesian Inference and Maximum Entropy Methods in Science and Engineering, edited by Ali M-Djafari (American Institute of Physics, Melville, New York, 2001), p. 31.